GE Industrial Solutions AF-650 GP PROFINET - Manual (Page 25)

Depending on the setting of F-50 Reference Range the reference and MAV are scaled accordingly:
Illustration 6.2
NOTE
If F-50 Reference Range is set to [0] Min - Max, a negative reference will be handled as 0%.
The actual output of the frequency converter is limited by the speed limit parameters in F-18 Motor Speed Low Limit [RPM]
to F-15 Motor Speed High Limit [Hz].
The final speed limit is set by F-03 Max Output Frequency 1.
The reference and the MAV have the format which appears
from the table
MRV / MAV Integer in hex Integer in decimal
100% 4000 16.384
75% 3000 12.288
50% 2000 8.192
25% 1000 4.096
0% 0 0
-25% F000 -4.096
-50% E000 -8.192
-75% D000 -12.288
-100% C000 -16.384
Table 6.4
NOTE
Negative numbers are formed as two's complement.
NOTE
The data type for MRV and MAV is a N2 16 bit
standardised value, meaning it can express a range from
-200% to +200% (8001 to 7FFF).
H-40 Configuration Mode set to [0] Speed open loop.
F-50 Reference Range set to [0] Min - Max.
F-52 Minimum Reference set to 100 RPM.
F-53 Maximum Reference set to 3000 RPM.
MRV / MAV Actual Speed
0% 0 hex 100 RPM
25% 1000 hex 825 RPM
50% 2000 hex 1550 RPM
75% 3000 hex 2275 RPM
100% 4000 hex 3000 RPM
Table 6.5
6.2.4 Process Control Operation
In process control operation H-40 Configuration Mode is set
to [3] Process.
The reference range in F-50 Reference Range is alway [0]
Min - Max.
- MRV represents the process setpoint.
- MAV expresses the actual process feedback (range +/-
200%).
How to Control the Frequenc... PROFINET Operating Instruction
24
6 6